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PSU: Coolermaster RS850-EMBA

Tom's New Reference System

We looked around for a powerful and modern power supply unit. It's tough to pick the best product, as there have been various products with high output and 80+% energy efficiency. Cost wasn't an issue, and we wanted something really solid to support dual, triple and quad graphics setups, so our choice was the RS850-EMBA by Coolermaster Compare Prices on Cooler Master RS850-EMBA , which reaches more than 85% efficiency at low noise levels. It provides a sustained maximum power of 850 W and a peak power of 1,000 W, and is backed by a three-year factory warranty.

This PSU has a total of six 12 V rails, four of them delivering 18 A and two of them 28 A each. The 5 V rail is rated at a maximum of 30 A and the device will deliver 25 A at 3.3 V. Have a look at the label photo below to get an overview of this PSU's power distribution.

There is a modular version, the RS850-ESBA; our version, the RS850-EMBA, comes with the full set of ATX 2.3 / EPS 2.91 power connectors, 90-260 V input voltage auto-sensing, four 6-pin PCI Express aux connectors, two 8-pin aux connectors, six Molex connectors, eight SATA power connectors and two legacy 4-pin floppy connectors. That should really be enough for everyone.

We found a little drawback, though: this product does not have a physical power switch, which means that it'll draw a few watts of standby power all the time. this also means that you'll have to physically unplug it if you go on vacation and want to switch everything completely off.

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